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Groundwater level measurements recorded at a well within one mile of the site indicate an <br />approximate drop of 13 feet from 1959 to 1985. Groundwater level measurements <br />recorded at on-site monitoring wells indicate an approximate drop of 10 feet from 1990 to <br />2003. The permeability of the soils from the surface to a depth of 60 feet ranges from 10"3 <br />to 10"9 centimeters per second. <br />C. Locations of buildings and structures relative to the migration monitoring perimeter do not <br />require special design features in the soil gas wells. All structures within the landfill <br />property limit are also within the monitoring perimeter, and therefore will be monitored as <br />"on-site" structures(Figure 2). <br />D. Adjacent land use and inhabitable structures within 1000 feet of the disposal site property <br />boundary does not require special design features. <br />The adjacent lands are used for agriculture livestock grazing. <br />No inhabitable structures are within 1000 feet of the disposal site, except for: <br />1. The residence 700 feet north of the northern property boundary, <br />approximately 3,000 feet from the monitoring perimeter. <br />2. The residence 125 feet west of the western property boundary, <br />approximately 3,050 feet from the monitoring perimeter. <br />E. Man-made pathways, such as underground construction do not exist. <br />F. The soil gas wells are located outside the limit of refuse. <br />G. Wells were bored at least the elevation of the bottom of the waste within 1000 feet of the <br />well. <br />On-site Structure Monitoring <br />Occupiable structures within the interim monitoring perimeter will be monitored for methane gas <br />concentration. These structures and their monitoring points of compliance include: <br />A. Scalehouse: <br />- Interior air <br />- Electrical conduit entry point within the building <br />B. Maintenance building: <br />- Interior air <br />- Electrical conduit entry point within the building <br />C. Manager's Residence: <br />- Crawl space below building <br />- Electrical conduit entry point within the building <br />Foothill Landfill Methane Monitoring 2 <br />September 15, 2003 <br />0 <br />Public Works/Solid Waste <br />County of San Joaquin <br />